If you follow the link above you'll see the example thus:
physdiskwrite [-u] generic-pc-xxx.img
The [] brackets denote that the -u is optional, but in your case necessary. Therefore, you will type
physdiskwrite -u generic-pc-1.231.img
or
physdiskwrite -u generic-pc-1.3b2.img
if you are using the beta image.
Post back to let us know how it goes.
db
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